Ceiling ventilator



1961 w. H. B RAsK AMP ,972,896

CEILING VENTILATOR Filed Nov. 21. 1957 A III lllllll v lo I 1|Illlll mm United States Patent CEILING VENTILATOR Willem Hendrik Braskamp, Voorburg, Netherlands, assignor to N.V. Industriele Onderneming W. H. Braskamp, Rijswijk, Netherlands, a Dutch limited-liability company 7 Filed Nov. 21, 1957, Ser. No. 697,991

Claims priority, application Netherlands Oct. 19, 1957 1 Claim. (Cl. 74--86) The invention relates to ceiling ventilators, and more particularly to ventilators of the type having a downwardly directed axis of rotation and driven by an electric motor.

The invention has as an object the improving of the elfect of ceiling ventilators so that the etfect is quite noticeable in all parts of the room to be ventilated.

According to the invention this object is attained by an arrangement whereby the casing of the ventilator is suspended by a universal coupling, while a driven shaft extends in the upward direction from the casing of the motor, said shaft co-operating with a stationary guiding member, whose guiding surface describes a closed path about a vertical axis through the suspension. When the ventilator is started, the driven shaft rotates, as a consequence of which this shaft tends to move along the guiding surface, as permitted by the pivotal suspension of the casing of the ventilator. Owing to this the casing of the ventilator itself also begins to swing round in a well-defined path, which path is determined by the shape of the guiding member. According to the invention this guiding member may be, for example, a circular or an oval disc.

Because the driven shaft, which may be the prolongation of the shaft of the motor, rests against the guiding member, the ventilator will assume an oblique position relative to the vertical axis through the suspension. When the ventilator is started, in addition to the normal effect of the ventilator the effect is produced that the flow proceeding from the ventilator makes an angle of inclination or a greater angle of inclination with the vertical and is thus better able to penetrate into the corners of the room. All of the corners of the room are reached because the ventilator describes a path about the guiding member, while in addition the effect of a swinging ventilator is obtained, which gives rise to a vortex of air.

The invention will now be elucidated more fully with reference to the drawing, in the sole figure of which the ventilator provided according to the invention is shown diagrammatically, partly broken away in front view and partly in cross-section.

ICE

The ventilator shown in the drawing comprises a motor casing 1 with a rotor 2 and vanes 4 fitted on arms 3. The casing 1 is pivotally suspended by arms 5 on gudgeons 6 of a yoke 7, which is itself pivotally suspended by pivot 8 on a tube or vertical post 9, which serves to secure the ventilator to the ceiling. Elements 6-8 constitute a universal coupling and the motor has its center of gravity positioned below this coupling. This suspension of the ventilator permits pivotal movements about two intersecting axes, so that the motor casing of the ventilator can swing round freely and universally without itself rotating relative to its suspension.

The shaft 10 extending upwardly from and driven by the motor rests with a conical part 11 against the lateral friction surface of a horizontal rubber disc or guide 12, fitted at the lower end of the tube 9. The disc is frusto conical so that it will efficiently engage the cone 11. This engagement is further enhanced due to the fact that the full weight of the motor as well as the fan itself urges part 11 against disc 12. Upon rotation of the shaft 10 the latter will move the cone 11 along the disc 12 in a closed loop and thus bring about a movement around the disc 12. It is possible to provide for a fastening of the disc 12 such that discs of different dimensions and/or forms can easily be mounted, so that variation in movement of the ventilator is possible, e.g. with a view to adjustment to the specific room in which the ventilator is to be used. In an oblong room, for example, an oval disc will be very effective.

What I claim is:

Apparatus for supporting and driving a fan comprising a vertical post, a universal coupling on the post and spaced substantially from the bottom of the latter, a motor positioned effectivelybelow the post and suspended from and substantially below the coupling, a guide on and toward the bottom of the post,'said guide being positioned below said universal coupling and between the latter and said motor, and a driven shaft in and extending upwardly from the motor to engage the guide and to drive the motor in a closed loop around the post, the guide being a horizontal disc centered on the post, the disc having a lateral friction surface and the shaft including a frustoconical extremity engaging said surface.

References Cited in the file of this patent UNITED STATES PATENTS 1,021,536 Laskey Mar. 26, 1912 1,099,693 Diehl June 9, 1914 1,456,433 Glasser May 22, 1923 1,650,280 Koenig Nov. 22, 1927 1,699,201 Guth Jan. 15, 1929 FOREIGN PATENTS 68,516 Netherlands Aug. 15, 1951 503,527 Italy Dec. 6, 1954 

